HydroBASINS lev08 watershed · #4080043300
Bassin de 荒川
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 9 administrative regions : Aga, Iide, Murakami, Nagai, Nishikawa +4
Sub-basin area
1 105,9km²
Upstream area
1 106km²
Discharge
36,37m³/s
Mean elev.
497m
Administrative coverage
9 dept-equivalent regions (GADM L2)
- 715.7 km²64.7% of basin
- 296.6 km²26.8% of basin
- 57.0 km²5.1% of basin
- 28.9 km²2.6% of basin
- 5.9 km²0.5% of basin
- 1.5 km²0.1% of basin
- ShibataNiigata · Japan0.7 km²0.1% of basin
- 0.2 km²0.0% of basin
1 moreFull L2 list
- Aga0.0 km² · 0.0%
19 intersecting protected areas
Bandai asahi
IUCN IINational Park
203.98 km² overlap
Green Corridor
107.53 km² overlap
Iidesan
IUCN IVPrefectural Wildlife Protection Area
100.33 km² overlap
Iidesan Shuhen
IUCN IbForest Ecosystem Reserve
97.55 km² overlap
Asahi Sanchi
IUCN IbForest Ecosystem Reserve
86.99 km² overlap
Otori asahi
IUCN IVNational Wildlife Protection Area
32.27 km² overlap
Oguni
IUCN IVPrefectural Wildlife Protection Area
24.97 km² overlap
Shibakura
IUCN IVPrefectural Wildlife Protection Area
18.59 km² overlap
Takanosu
IUCN IVPrefectural Wildlife Protection Area
12.97 km² overlap
10 more protected areassorted by overlap area
Mitsui's Forests / Kaname Forest
IUCN Not ApplicableOECM
7.37 km² overlap
Tainai ninoji
IUCN VPrefectural Natural Park
4.74 km² overlap
Ohanayama
IUCN IVPrefectural Wildlife Protection Area
3.04 km² overlap
Tainai
IUCN IVPrefectural Wildlife Protection Area
0.72 km² overlap
Kitamatadake
IUCN IVPrefectural Wildlife Protection Area
0.45 km² overlap
Nurumata sawa-Nogawa
IUCN VPrefectural Nature Conservation Area
0.19 km² overlap
Iide
IUCN IVPrefectural Wildlife Protection Area
0.15 km² overlap
Oishizawa Buna
IUCN IVRare Population Protected Forest
0.08 km² overlap
Shirakawa
IUCN IVPrefectural Wildlife Protection Area
0.05 km² overlap
Common fishery right area
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 442 distinct species · 3 507 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 16 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de 荒川 : 12 espèces reliées par 17 interactions GloBI sur 4 types (connectance 12.5%, filtre Serrano α=0.2). 5 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
9,9°C
Annual rain
1 841mm
Moisture idx (CMI)
0,52
Runoff
983mm/an
PET
880mm
AET
860mm
Mean slope
17,0°
Water table
538cm
Forest
80%
Crops
4%
Urban
1%
Protected
25%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)